24 Workers can build a wall in 40 hours. If the wall is required to be built in
30 hours, how many more workers will be needed?
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Step-by-step explanation:
The fraction of work done each hour by one worker is 1/15 x 1/48 = 1/720.
In 30 hours one worker could do 30 x 1/720 = 1/24 of the work, so you will need 24 workers to do the work in 30 hours.
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